Hex math is weird. Since there are 6 directions instead of 4, there's no simple mapping between hex positions and 2D x,y coordinates. The naive approach is offset coordinates — numbering cells left-to-right, top-to-bottom like a regular grid. This works until you need to find neighbors, compute distances, or do anything involving directions. Then it gets confusing fast, with different formulas for odd and even rows.
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Number (15): Everything in this space must add up to 15. The answer is 5-1, placed horizontally; 5-5, placed vertically.
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